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What is Data Remanence?

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Data remanence are residual representations of data that remain after deleting files or reformatting data storage devices. It is common for operating systems to logically delete files leaving them physically present on a storage device. In theory, it is also possible to recover data that has been sparsely overwritten using techniques such as magnetic force microscopy.
Security practices often call for properly deleting files with wiping or more extensive measures such as degaussing or physical destruction of devices. It is also common to fully encrypt drives to make all files unreadable without a security key.

Feasibility of Recovering Overwritten Data

In theory it is remotely possible to recover data that has been overwritten. For this reason, wiping tools may overwrite data three times often will all zeros, all ones and finishing with a pseudorandom pattern.
Overview: Data Remanence
Type
Information Security
Definition
Traces of data that remain after deleting, formatting or overwriting data.
Also Known As
Residual Data
Related Concepts
Data Wiping
Information Security
Degaussing

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